Hook um_submit_form_error

um_submit_form_error.php

<?php

/**
 * Hook: um_submit_form_error
 *
 * Type: filter
 *
 * Description: Change error text on the form submit.
 *
 * @example https://github.com/ultimatemember/ultimatemember/blob/master/includes/core/class-form.php#L289
 * @link    https://docs.ultimatemember.com/article/1272-umsubmitformerror
 *
 * @package um\core
 * @see     um\core\Form::add_error()
 * @since   2.0
 * @version 3.0
 *
 * @param string $error Error string.
 * @param string $key   Error key.
 *
 * @return string Error string.
 */
function my_submit_form_error( $error, $key ) {
	// your code here.
	return $error;
}
add_filter( 'um_submit_form_error', 'my_submit_form_error', 10, 2 );